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gerrit-public.fairphone.software / toolchain / llvm-project / 77efb73c672762ce28cfff793db414ce05e3c46a / . / llvm / test / Transforms / IndVarSimplify / predicated_ranges.ll
blob: a730f74ff5113a320c160f46416d5cb4907324f2 [file] [log] [blame]
Max Kazantsevda9e7b12020-08-07 16:46:39 +0700[diff] [blame]1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -indvars -S < %s | FileCheck %s
3; RUN: opt -passes=indvars -S < %s | FileCheck %s
4
Max Kazantsevf8470942020-11-03 13:18:46 +0700[diff] [blame]5; Check that we are able to remove the range check basing on the following facts:
Max Kazantsev8a3907c2020-09-02 18:26:11 +0700[diff] [blame]6; 0 <= len <= MAX_INT [1];
Max Kazantsevda9e7b12020-08-07 16:46:39 +0700[diff] [blame]7; iv starts from len and goes down stopping at zero and [1], therefore
8; 0 <= iv <= len [2];
9; 3. In range_check_block, iv != 0 and [2], therefore
10; 1 <= iv <= len [3];
11; 4. iv.next = iv - 1 and [3], therefore
12; 0 <= iv.next < len.
Max Kazantsev8a04cdb2020-09-16 11:30:21 +0700[diff] [blame]13define void @test_predicated_simple_unsigned(i32* %p, i32* %arr) {
14; CHECK-LABEL: @test_predicated_simple_unsigned(
Max Kazantsev8a3907c2020-09-02 18:26:11 +0700[diff] [blame]15; CHECK-NEXT: preheader:
16; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[P:%.*]], align 4, [[RNG0:!range !.*]]
Max Kazantsevda9e7b12020-08-07 16:46:39 +0700[diff] [blame]17; CHECK-NEXT: br label [[LOOP:%.*]]
18; CHECK: loop:
Max Kazantsev8a3907c2020-09-02 18:26:11 +0700[diff] [blame]19; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[LEN]], [[PREHEADER:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
Max Kazantsevda9e7b12020-08-07 16:46:39 +0700[diff] [blame]20; CHECK-NEXT: [[ZERO_COND:%.*]] = icmp eq i32 [[IV]], 0
21; CHECK-NEXT: br i1 [[ZERO_COND]], label [[EXIT:%.*]], label [[RANGE_CHECK_BLOCK:%.*]]
22; CHECK: range_check_block:
23; CHECK-NEXT: [[IV_NEXT]] = sub i32 [[IV]], 1
Max Kazantsevf8470942020-11-03 13:18:46 +0700[diff] [blame]24; CHECK-NEXT: br i1 true, label [[BACKEDGE]], label [[FAIL:%.*]]
Max Kazantsevda9e7b12020-08-07 16:46:39 +0700[diff] [blame]25; CHECK: backedge:
26; CHECK-NEXT: [[EL_PTR:%.*]] = getelementptr i32, i32* [[P]], i32 [[IV]]
27; CHECK-NEXT: [[EL:%.*]] = load i32, i32* [[EL_PTR]], align 4
28; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp eq i32 [[EL]], 0
29; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT]]
30; CHECK: exit:
31; CHECK-NEXT: ret void
Max Kazantsevda9e7b12020-08-07 16:46:39 +0700[diff] [blame]32; CHECK: fail:
33; CHECK-NEXT: unreachable
34;
Max Kazantsevda9e7b12020-08-07 16:46:39 +0700[diff] [blame]35preheader:
Max Kazantsev8a3907c2020-09-02 18:26:11 +0700[diff] [blame]36 %len = load i32, i32* %p, !range !0
Max Kazantsevda9e7b12020-08-07 16:46:39 +0700[diff] [blame]37 br label %loop
38
39loop:
40 %iv = phi i32 [%len, %preheader], [%iv.next, %backedge]
41 %zero_cond = icmp eq i32 %iv, 0
42 br i1 %zero_cond, label %exit, label %range_check_block
43
44range_check_block:
45 %iv.next = sub i32 %iv, 1
46 %range_check = icmp ult i32 %iv.next, %len
47 br i1 %range_check, label %backedge, label %fail
48
49backedge:
50 %el.ptr = getelementptr i32, i32* %p, i32 %iv
51 %el = load i32, i32* %el.ptr
52 %loop.cond = icmp eq i32 %el, 0
53 br i1 %loop.cond, label %loop, label %exit
54
55exit:
56 ret void
57
58fail:
59 unreachable
60}
61
Max Kazantsev8a04cdb2020-09-16 11:30:21 +0700[diff] [blame]62define void @test_predicated_simple_signed(i32* %p, i32* %arr) {
63; CHECK-LABEL: @test_predicated_simple_signed(
64; CHECK-NEXT: preheader:
65; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[P:%.*]], align 4, [[RNG0]]
66; CHECK-NEXT: br label [[LOOP:%.*]]
67; CHECK: loop:
68; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[LEN]], [[PREHEADER:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
69; CHECK-NEXT: [[ZERO_COND:%.*]] = icmp eq i32 [[IV]], 0
70; CHECK-NEXT: br i1 [[ZERO_COND]], label [[EXIT:%.*]], label [[RANGE_CHECK_BLOCK:%.*]]
71; CHECK: range_check_block:
72; CHECK-NEXT: [[IV_NEXT]] = sub i32 [[IV]], 1
Max Kazantsev160a4532020-10-28 17:37:20 +0700[diff] [blame]73; CHECK-NEXT: br i1 true, label [[BACKEDGE]], label [[FAIL:%.*]]
Max Kazantsev8a04cdb2020-09-16 11:30:21 +0700[diff] [blame]74; CHECK: backedge:
75; CHECK-NEXT: [[EL_PTR:%.*]] = getelementptr i32, i32* [[P]], i32 [[IV]]
76; CHECK-NEXT: [[EL:%.*]] = load i32, i32* [[EL_PTR]], align 4
77; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp eq i32 [[EL]], 0
78; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT]]
79; CHECK: exit:
80; CHECK-NEXT: ret void
81; CHECK: fail:
82; CHECK-NEXT: unreachable
83;
84preheader:
85 %len = load i32, i32* %p, !range !0
86 br label %loop
87
88loop:
89 %iv = phi i32 [%len, %preheader], [%iv.next, %backedge]
90 %zero_cond = icmp eq i32 %iv, 0
91 br i1 %zero_cond, label %exit, label %range_check_block
92
93range_check_block:
94 %iv.next = sub i32 %iv, 1
95 %range_check = icmp slt i32 %iv.next, %len
96 br i1 %range_check, label %backedge, label %fail
97
98backedge:
99 %el.ptr = getelementptr i32, i32* %p, i32 %iv
100 %el = load i32, i32* %el.ptr
101 %loop.cond = icmp eq i32 %el, 0
102 br i1 %loop.cond, label %loop, label %exit
103
104exit:
105 ret void
106
107fail:
108 unreachable
109}
110
Max Kazantsev69851352020-09-16 14:24:00 +0700[diff] [blame]111; Cannot remove checks because the range check fails on the last iteration.
112define void @predicated_outside_loop_signed_neg(i32 %arg) nounwind #0 {
113; CHECK-LABEL: @predicated_outside_loop_signed_neg(
Max Kazantsev94f7d3d2020-09-16 13:59:41 +0700[diff] [blame]114; CHECK-NEXT: entry:
115; CHECK-NEXT: [[SUB1:%.*]] = sub nsw i32 [[ARG:%.*]], 1
116; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 0, [[SUB1]]
117; CHECK-NEXT: br i1 [[CMP1]], label [[OUTER_PREHEADER:%.*]], label [[EXIT:%.*]]
118; CHECK: outer.preheader:
119; CHECK-NEXT: br label [[OUTER:%.*]]
120; CHECK: outer:
121; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_INC:%.*]], [[OUTER_INC:%.*]] ], [ 0, [[OUTER_PREHEADER]] ]
122; CHECK-NEXT: [[SUB2:%.*]] = sub nsw i32 [[ARG]], [[I]]
123; CHECK-NEXT: [[SUB3:%.*]] = sub nsw i32 [[SUB2]], 1
124; CHECK-NEXT: [[CMP2:%.*]] = icmp slt i32 0, [[SUB3]]
125; CHECK-NEXT: br i1 [[CMP2]], label [[INNER_PH:%.*]], label [[OUTER_INC]]
126; CHECK: inner.ph:
127; CHECK-NEXT: br label [[INNER:%.*]]
128; CHECK: inner:
129; CHECK-NEXT: br i1 false, label [[INNER]], label [[OUTER_INC_LOOPEXIT:%.*]]
130; CHECK: outer.inc.loopexit:
131; CHECK-NEXT: br label [[OUTER_INC]]
132; CHECK: outer.inc:
133; CHECK-NEXT: [[I_INC]] = add nuw nsw i32 [[I]], 1
134; CHECK-NEXT: br i1 false, label [[OUTER]], label [[EXIT_LOOPEXIT:%.*]]
135; CHECK: exit.loopexit:
136; CHECK-NEXT: br label [[EXIT]]
137; CHECK: exit:
138; CHECK-NEXT: ret void
139;
140entry:
141 %sub1 = sub nsw i32 %arg, 1
142 %cmp1 = icmp slt i32 0, %sub1
143 br i1 %cmp1, label %outer, label %exit
144
145outer:
146 %i = phi i32 [ 0, %entry ], [ %i.inc, %outer.inc ]
147 %sub2 = sub nsw i32 %arg, %i
148 %sub3 = sub nsw i32 %sub2, 1
149 %cmp2 = icmp slt i32 0, %sub3
150 br i1 %cmp2, label %inner.ph, label %outer.inc
151
152inner.ph:
153 br label %inner
154
155inner:
156 %j = phi i32 [ 0, %inner.ph ], [ %j.inc, %inner ]
157 %j.inc = add nsw i32 %j, 1
158 %cmp3 = icmp slt i32 %j.inc, %sub3
159 br i1 %cmp3, label %inner, label %outer.inc
160
161outer.inc:
162 %i.inc = add nsw i32 %i, 1
163 %cmp4 = icmp slt i32 %i.inc, %arg
164 br i1 %cmp4, label %outer, label %exit
165
166exit:
167 ret void
168}
169
Max Kazantsev69851352020-09-16 14:24:00 +0700[diff] [blame]170; Range check can be removed.
171define void @predicated_outside_loop_signed_pos(i32 %arg) nounwind #0 {
172; CHECK-LABEL: @predicated_outside_loop_signed_pos(
173; CHECK-NEXT: entry:
174; CHECK-NEXT: [[SUB1:%.*]] = sub nsw i32 [[ARG:%.*]], 1
175; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 0, [[SUB1]]
176; CHECK-NEXT: br i1 [[CMP1]], label [[OUTER_PREHEADER:%.*]], label [[EXIT:%.*]]
177; CHECK: outer.preheader:
178; CHECK-NEXT: br label [[OUTER:%.*]]
179; CHECK: outer:
180; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_INC:%.*]], [[OUTER_INC:%.*]] ], [ 0, [[OUTER_PREHEADER]] ]
181; CHECK-NEXT: [[SUB2:%.*]] = sub nsw i32 [[ARG]], [[I]]
182; CHECK-NEXT: [[SUB3:%.*]] = sub nsw i32 [[SUB2]], 1
183; CHECK-NEXT: [[CMP2:%.*]] = icmp slt i32 0, [[SUB3]]
184; CHECK-NEXT: br i1 [[CMP2]], label [[INNER_PH:%.*]], label [[OUTER_INC]]
185; CHECK: inner.ph:
186; CHECK-NEXT: br label [[INNER:%.*]]
187; CHECK: inner:
188; CHECK-NEXT: br i1 false, label [[INNER]], label [[OUTER_INC_LOOPEXIT:%.*]]
189; CHECK: outer.inc.loopexit:
190; CHECK-NEXT: br label [[OUTER_INC]]
191; CHECK: outer.inc:
192; CHECK-NEXT: [[I_INC]] = add nuw nsw i32 [[I]], 1
193; CHECK-NEXT: br i1 false, label [[OUTER]], label [[EXIT_LOOPEXIT:%.*]]
194; CHECK: exit.loopexit:
195; CHECK-NEXT: br label [[EXIT]]
196; CHECK: exit:
197; CHECK-NEXT: ret void
198;
199entry:
200 %sub1 = sub nsw i32 %arg, 1
201 %cmp1 = icmp slt i32 0, %sub1
202 br i1 %cmp1, label %outer, label %exit
203
204outer:
205 %i = phi i32 [ 0, %entry ], [ %i.inc, %outer.inc ]
206 %sub2 = sub nsw i32 %arg, %i
207 %sub3 = sub nsw i32 %sub2, 1
208 %cmp2 = icmp slt i32 0, %sub3
209 br i1 %cmp2, label %inner.ph, label %outer.inc
210
211inner.ph:
212 br label %inner
213
214inner:
215 %j = phi i32 [ 0, %inner.ph ], [ %j.inc, %inner ]
216 %j.inc = add nsw i32 %j, 1
217 %cmp3 = icmp slt i32 %j.inc, %sub3
218 br i1 %cmp3, label %inner, label %outer.inc
219
220outer.inc:
221 %i.inc = add nsw i32 %i, 1
222 %cmp4 = icmp slt i32 %i.inc, %sub1
223 br i1 %cmp4, label %outer, label %exit
224
225exit:
226 ret void
227}
228
Max Kazantsev94f7d3d2020-09-16 13:59:41 +0700[diff] [blame]229define void @predicated_outside_loop_unsigned(i32 %arg) nounwind #0 {
230; CHECK-LABEL: @predicated_outside_loop_unsigned(
231; CHECK-NEXT: entry:
232; CHECK-NEXT: [[SUB1:%.*]] = sub nsw i32 [[ARG:%.*]], 1
233; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 0, [[SUB1]]
234; CHECK-NEXT: br i1 [[CMP1]], label [[OUTER_PREHEADER:%.*]], label [[EXIT:%.*]]
235; CHECK: outer.preheader:
236; CHECK-NEXT: br label [[OUTER:%.*]]
237; CHECK: outer:
238; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_INC:%.*]], [[OUTER_INC:%.*]] ], [ 0, [[OUTER_PREHEADER]] ]
239; CHECK-NEXT: [[SUB2:%.*]] = sub nsw i32 [[ARG]], [[I]]
240; CHECK-NEXT: [[SUB3:%.*]] = sub nsw i32 [[SUB2]], 1
241; CHECK-NEXT: [[CMP2:%.*]] = icmp ult i32 0, [[SUB3]]
242; CHECK-NEXT: br i1 [[CMP2]], label [[INNER_PH:%.*]], label [[OUTER_INC]]
243; CHECK: inner.ph:
244; CHECK-NEXT: br label [[INNER:%.*]]
245; CHECK: inner:
246; CHECK-NEXT: br i1 false, label [[INNER]], label [[OUTER_INC_LOOPEXIT:%.*]]
247; CHECK: outer.inc.loopexit:
248; CHECK-NEXT: br label [[OUTER_INC]]
249; CHECK: outer.inc:
250; CHECK-NEXT: [[I_INC]] = add nuw nsw i32 [[I]], 1
251; CHECK-NEXT: br i1 false, label [[OUTER]], label [[EXIT_LOOPEXIT:%.*]]
252; CHECK: exit.loopexit:
253; CHECK-NEXT: br label [[EXIT]]
254; CHECK: exit:
255; CHECK-NEXT: ret void
256;
257entry:
258 %sub1 = sub nsw i32 %arg, 1
259 %cmp1 = icmp slt i32 0, %sub1
260 br i1 %cmp1, label %outer, label %exit
261
262outer:
263 %i = phi i32 [ 0, %entry ], [ %i.inc, %outer.inc ]
264 %sub2 = sub nsw i32 %arg, %i
265 %sub3 = sub nsw i32 %sub2, 1
266 %cmp2 = icmp ult i32 0, %sub3
267 br i1 %cmp2, label %inner.ph, label %outer.inc
268
269inner.ph:
270 br label %inner
271
272inner:
273 %j = phi i32 [ 0, %inner.ph ], [ %j.inc, %inner ]
274 %j.inc = add nsw i32 %j, 1
275 %cmp3 = icmp slt i32 %j.inc, %sub3
276 br i1 %cmp3, label %inner, label %outer.inc
277
278outer.inc:
279 %i.inc = add nsw i32 %i, 1
280 %cmp4 = icmp slt i32 %i.inc, %arg
281 br i1 %cmp4, label %outer, label %exit
282
283exit:
284 ret void
285}
286
Max Kazantsev69851352020-09-16 14:24:00 +0700[diff] [blame]287; Cannot remove checks because the range check fails on the last iteration.
288define void @predicated_inside_loop_signed_neg(i32 %arg) nounwind #0 {
289; CHECK-LABEL: @predicated_inside_loop_signed_neg(
Max Kazantsev94f7d3d2020-09-16 13:59:41 +0700[diff] [blame]290; CHECK-NEXT: entry:
291; CHECK-NEXT: br label [[OUTER:%.*]]
292; CHECK: outer:
293; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[I_INC:%.*]], [[OUTER_INC:%.*]] ]
294; CHECK-NEXT: [[SUB1:%.*]] = sub nsw i32 [[ARG:%.*]], 1
295; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 0, [[SUB1]]
296; CHECK-NEXT: br i1 [[CMP1]], label [[GUARDED:%.*]], label [[EXIT:%.*]]
297; CHECK: guarded:
298; CHECK-NEXT: [[SUB2:%.*]] = sub nsw i32 [[ARG]], [[I]]
299; CHECK-NEXT: [[SUB3:%.*]] = sub nsw i32 [[SUB2]], 1
300; CHECK-NEXT: [[CMP2:%.*]] = icmp slt i32 0, [[SUB3]]
301; CHECK-NEXT: br i1 [[CMP2]], label [[INNER_PH:%.*]], label [[OUTER_INC]]
302; CHECK: inner.ph:
303; CHECK-NEXT: br label [[INNER:%.*]]
304; CHECK: inner:
305; CHECK-NEXT: br i1 false, label [[INNER]], label [[OUTER_INC_LOOPEXIT:%.*]]
306; CHECK: outer.inc.loopexit:
307; CHECK-NEXT: br label [[OUTER_INC]]
308; CHECK: outer.inc:
309; CHECK-NEXT: [[I_INC]] = add nuw nsw i32 [[I]], 1
310; CHECK-NEXT: [[CMP4:%.*]] = icmp slt i32 [[I_INC]], [[ARG]]
311; CHECK-NEXT: br i1 [[CMP4]], label [[OUTER]], label [[EXIT]]
312; CHECK: exit:
313; CHECK-NEXT: ret void
314;
315entry:
316 br label %outer
317
318outer:
319 %i = phi i32 [ 0, %entry ], [ %i.inc, %outer.inc ]
320 %sub1 = sub nsw i32 %arg, 1
321 %cmp1 = icmp slt i32 0, %sub1
322 br i1 %cmp1, label %guarded, label %exit
323
324guarded:
325 %sub2 = sub nsw i32 %arg, %i
326 %sub3 = sub nsw i32 %sub2, 1
327 %cmp2 = icmp slt i32 0, %sub3
328 br i1 %cmp2, label %inner.ph, label %outer.inc
329
330inner.ph:
331 br label %inner
332
333inner:
334 %j = phi i32 [ 0, %inner.ph ], [ %j.inc, %inner ]
335 %j.inc = add nsw i32 %j, 1
336 %cmp3 = icmp slt i32 %j.inc, %sub3
337 br i1 %cmp3, label %inner, label %outer.inc
338
339outer.inc:
340 %i.inc = add nsw i32 %i, 1
341 %cmp4 = icmp slt i32 %i.inc, %arg
342 br i1 %cmp4, label %outer, label %exit
343
344exit:
345 ret void
346}
347
Max Kazantsev69851352020-09-16 14:24:00 +0700[diff] [blame]348; Range check can be trivially removed.
349define void @predicated_inside_loop_signed_pos(i32 %arg) nounwind #0 {
350; CHECK-LABEL: @predicated_inside_loop_signed_pos(
351; CHECK-NEXT: entry:
352; CHECK-NEXT: br label [[OUTER:%.*]]
353; CHECK: outer:
354; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[I_INC:%.*]], [[OUTER_INC:%.*]] ]
355; CHECK-NEXT: [[SUB1:%.*]] = sub nsw i32 [[ARG:%.*]], 1
356; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 0, [[SUB1]]
357; CHECK-NEXT: br i1 [[CMP1]], label [[GUARDED:%.*]], label [[EXIT:%.*]]
358; CHECK: guarded:
359; CHECK-NEXT: [[SUB2:%.*]] = sub nsw i32 [[ARG]], [[I]]
360; CHECK-NEXT: [[SUB3:%.*]] = sub nsw i32 [[SUB2]], 1
361; CHECK-NEXT: [[CMP2:%.*]] = icmp slt i32 0, [[SUB3]]
362; CHECK-NEXT: br i1 [[CMP2]], label [[INNER_PH:%.*]], label [[OUTER_INC]]
363; CHECK: inner.ph:
364; CHECK-NEXT: br label [[INNER:%.*]]
365; CHECK: inner:
366; CHECK-NEXT: br i1 false, label [[INNER]], label [[OUTER_INC_LOOPEXIT:%.*]]
367; CHECK: outer.inc.loopexit:
368; CHECK-NEXT: br label [[OUTER_INC]]
369; CHECK: outer.inc:
370; CHECK-NEXT: [[I_INC]] = add nuw nsw i32 [[I]], 1
371; CHECK-NEXT: [[CMP4:%.*]] = icmp slt i32 [[I_INC]], [[SUB1]]
372; CHECK-NEXT: br i1 [[CMP4]], label [[OUTER]], label [[EXIT]]
373; CHECK: exit:
374; CHECK-NEXT: ret void
375;
376entry:
377 br label %outer
378
379outer:
380 %i = phi i32 [ 0, %entry ], [ %i.inc, %outer.inc ]
381 %sub1 = sub nsw i32 %arg, 1
382 %cmp1 = icmp slt i32 0, %sub1
383 br i1 %cmp1, label %guarded, label %exit
384
385guarded:
386 %sub2 = sub nsw i32 %arg, %i
387 %sub3 = sub nsw i32 %sub2, 1
388 %cmp2 = icmp slt i32 0, %sub3
389 br i1 %cmp2, label %inner.ph, label %outer.inc
390
391inner.ph:
392 br label %inner
393
394inner:
395 %j = phi i32 [ 0, %inner.ph ], [ %j.inc, %inner ]
396 %j.inc = add nsw i32 %j, 1
397 %cmp3 = icmp slt i32 %j.inc, %sub3
398 br i1 %cmp3, label %inner, label %outer.inc
399
400outer.inc:
401 %i.inc = add nsw i32 %i, 1
402 %cmp4 = icmp slt i32 %i.inc, %sub1
403 br i1 %cmp4, label %outer, label %exit
404
405exit:
406 ret void
407}
408
Max Kazantsev94f7d3d2020-09-16 13:59:41 +0700[diff] [blame]409define void @predicated_inside_loop_unsigned(i32 %arg) nounwind #0 {
410; CHECK-LABEL: @predicated_inside_loop_unsigned(
411; CHECK-NEXT: entry:
412; CHECK-NEXT: br label [[OUTER:%.*]]
413; CHECK: outer:
414; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[I_INC:%.*]], [[OUTER_INC:%.*]] ]
415; CHECK-NEXT: [[SUB1:%.*]] = sub nsw i32 [[ARG:%.*]], 1
416; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 0, [[SUB1]]
417; CHECK-NEXT: br i1 [[CMP1]], label [[GUARDED:%.*]], label [[EXIT:%.*]]
418; CHECK: guarded:
419; CHECK-NEXT: [[SUB2:%.*]] = sub nsw i32 [[ARG]], [[I]]
420; CHECK-NEXT: [[SUB3:%.*]] = sub nsw i32 [[SUB2]], 1
421; CHECK-NEXT: [[CMP2:%.*]] = icmp ult i32 0, [[SUB3]]
422; CHECK-NEXT: br i1 [[CMP2]], label [[INNER_PH:%.*]], label [[OUTER_INC]]
423; CHECK: inner.ph:
424; CHECK-NEXT: br label [[INNER:%.*]]
425; CHECK: inner:
426; CHECK-NEXT: br i1 false, label [[INNER]], label [[OUTER_INC_LOOPEXIT:%.*]]
427; CHECK: outer.inc.loopexit:
428; CHECK-NEXT: br label [[OUTER_INC]]
429; CHECK: outer.inc:
430; CHECK-NEXT: [[I_INC]] = add nuw nsw i32 [[I]], 1
431; CHECK-NEXT: [[CMP4:%.*]] = icmp slt i32 [[I_INC]], [[ARG]]
432; CHECK-NEXT: br i1 [[CMP4]], label [[OUTER]], label [[EXIT]]
433; CHECK: exit:
434; CHECK-NEXT: ret void
435;
436entry:
437 br label %outer
438
439outer:
440 %i = phi i32 [ 0, %entry ], [ %i.inc, %outer.inc ]
441 %sub1 = sub nsw i32 %arg, 1
442 %cmp1 = icmp slt i32 0, %sub1
443 br i1 %cmp1, label %guarded, label %exit
444
445guarded:
446 %sub2 = sub nsw i32 %arg, %i
447 %sub3 = sub nsw i32 %sub2, 1
448 %cmp2 = icmp ult i32 0, %sub3
449 br i1 %cmp2, label %inner.ph, label %outer.inc
450
451inner.ph:
452 br label %inner
453
454inner:
455 %j = phi i32 [ 0, %inner.ph ], [ %j.inc, %inner ]
456 %j.inc = add nsw i32 %j, 1
457 %cmp3 = icmp slt i32 %j.inc, %sub3
458 br i1 %cmp3, label %inner, label %outer.inc
459
460outer.inc:
461 %i.inc = add nsw i32 %i, 1
462 %cmp4 = icmp slt i32 %i.inc, %arg
463 br i1 %cmp4, label %outer, label %exit
464
465exit:
466 ret void
467}
468
Max Kazantsev15985952020-09-28 12:04:20 +0700[diff] [blame]469define void @test_can_predicate_simple_unsigned(i32* %p, i32* %arr) {
470; CHECK-LABEL: @test_can_predicate_simple_unsigned(
471; CHECK-NEXT: preheader:
472; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[P:%.*]], align 4
Max Kazantsev77efb732020-11-13 12:05:14 +0700[diff] [blame^]473; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[LEN]], -1
Max Kazantsev15985952020-09-28 12:04:20 +0700[diff] [blame]474; CHECK-NEXT: br label [[LOOP:%.*]]
475; CHECK: loop:
476; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[LEN]], [[PREHEADER:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
477; CHECK-NEXT: [[ZERO_COND:%.*]] = icmp eq i32 [[IV]], 0
478; CHECK-NEXT: br i1 [[ZERO_COND]], label [[EXIT:%.*]], label [[RANGE_CHECK_BLOCK:%.*]]
479; CHECK: range_check_block:
480; CHECK-NEXT: [[IV_NEXT]] = sub i32 [[IV]], 1
Max Kazantsev77efb732020-11-13 12:05:14 +0700[diff] [blame^]481; CHECK-NEXT: [[RANGE_CHECK1:%.*]] = icmp ult i32 [[TMP0]], [[LEN]]
482; CHECK-NEXT: br i1 [[RANGE_CHECK1]], label [[BACKEDGE]], label [[FAIL:%.*]]
Max Kazantsev15985952020-09-28 12:04:20 +0700[diff] [blame]483; CHECK: backedge:
484; CHECK-NEXT: [[EL_PTR:%.*]] = getelementptr i32, i32* [[P]], i32 [[IV]]
485; CHECK-NEXT: [[EL:%.*]] = load i32, i32* [[EL_PTR]], align 4
486; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp eq i32 [[EL]], 0
487; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT]]
488; CHECK: exit:
489; CHECK-NEXT: ret void
490; CHECK: fail:
491; CHECK-NEXT: unreachable
492;
493preheader:
494 %len = load i32, i32* %p
495 br label %loop
496
497loop:
498 %iv = phi i32 [%len, %preheader], [%iv.next, %backedge]
499 %zero_cond = icmp eq i32 %iv, 0
500 br i1 %zero_cond, label %exit, label %range_check_block
501
502range_check_block:
503 %iv.next = sub i32 %iv, 1
504 %range_check = icmp ult i32 %iv.next, %len
505 br i1 %range_check, label %backedge, label %fail
506
507backedge:
508 %el.ptr = getelementptr i32, i32* %p, i32 %iv
509 %el = load i32, i32* %el.ptr
510 %loop.cond = icmp eq i32 %el, 0
511 br i1 %loop.cond, label %loop, label %exit
512
513exit:
514 ret void
515
516fail:
517 unreachable
518}
519
520define void @test_can_predicate_simple_signed(i32* %p, i32* %arr) {
521; CHECK-LABEL: @test_can_predicate_simple_signed(
522; CHECK-NEXT: preheader:
523; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[P:%.*]], align 4
524; CHECK-NEXT: br label [[LOOP:%.*]]
525; CHECK: loop:
526; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[LEN]], [[PREHEADER:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
527; CHECK-NEXT: [[ZERO_COND:%.*]] = icmp eq i32 [[IV]], 0
528; CHECK-NEXT: br i1 [[ZERO_COND]], label [[EXIT:%.*]], label [[RANGE_CHECK_BLOCK:%.*]]
529; CHECK: range_check_block:
530; CHECK-NEXT: [[IV_NEXT]] = sub i32 [[IV]], 1
531; CHECK-NEXT: [[RANGE_CHECK:%.*]] = icmp slt i32 [[IV_NEXT]], [[LEN]]
532; CHECK-NEXT: br i1 [[RANGE_CHECK]], label [[BACKEDGE]], label [[FAIL:%.*]]
533; CHECK: backedge:
534; CHECK-NEXT: [[EL_PTR:%.*]] = getelementptr i32, i32* [[P]], i32 [[IV]]
535; CHECK-NEXT: [[EL:%.*]] = load i32, i32* [[EL_PTR]], align 4
536; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp eq i32 [[EL]], 0
537; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT]]
538; CHECK: exit:
539; CHECK-NEXT: ret void
540; CHECK: fail:
541; CHECK-NEXT: unreachable
542;
543preheader:
544 %len = load i32, i32* %p
545 br label %loop
546
547loop:
548 %iv = phi i32 [%len, %preheader], [%iv.next, %backedge]
549 %zero_cond = icmp eq i32 %iv, 0
550 br i1 %zero_cond, label %exit, label %range_check_block
551
552range_check_block:
553 %iv.next = sub i32 %iv, 1
554 %range_check = icmp slt i32 %iv.next, %len
555 br i1 %range_check, label %backedge, label %fail
556
557backedge:
558 %el.ptr = getelementptr i32, i32* %p, i32 %iv
559 %el = load i32, i32* %el.ptr
560 %loop.cond = icmp eq i32 %el, 0
561 br i1 %loop.cond, label %loop, label %exit
562
563exit:
564 ret void
565
566fail:
567 unreachable
568}
569
Max Kazantsev63354462020-10-27 14:50:00 +0700[diff] [blame]570define void @test_can_predicate_trunc_unsigned(i32* %p, i32* %arr) {
571; CHECK-LABEL: @test_can_predicate_trunc_unsigned(
572; CHECK-NEXT: preheader:
573; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[P:%.*]], align 4
574; CHECK-NEXT: [[START:%.*]] = zext i32 [[LEN]] to i64
575; CHECK-NEXT: br label [[LOOP:%.*]]
576; CHECK: loop:
577; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[START]], [[PREHEADER:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
578; CHECK-NEXT: [[ZERO_COND:%.*]] = icmp eq i64 [[IV]], 0
579; CHECK-NEXT: br i1 [[ZERO_COND]], label [[EXIT:%.*]], label [[RANGE_CHECK_BLOCK:%.*]]
580; CHECK: range_check_block:
581; CHECK-NEXT: [[IV_NEXT]] = sub nsw i64 [[IV]], 1
582; CHECK-NEXT: [[NARROW:%.*]] = trunc i64 [[IV_NEXT]] to i32
583; CHECK-NEXT: [[RANGE_CHECK:%.*]] = icmp ult i32 [[NARROW]], [[LEN]]
584; CHECK-NEXT: br i1 [[RANGE_CHECK]], label [[BACKEDGE]], label [[FAIL:%.*]]
585; CHECK: backedge:
586; CHECK-NEXT: [[EL_PTR:%.*]] = getelementptr i32, i32* [[ARR:%.*]], i64 [[IV]]
587; CHECK-NEXT: [[EL:%.*]] = load i32, i32* [[EL_PTR]], align 4
588; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp eq i32 [[EL]], 0
589; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT]]
590; CHECK: exit:
591; CHECK-NEXT: ret void
592; CHECK: fail:
593; CHECK-NEXT: unreachable
594;
595preheader:
596 %len = load i32, i32* %p
597 %start = zext i32 %len to i64
598 br label %loop
599
600loop:
601 %iv = phi i64 [%start, %preheader], [%iv.next, %backedge]
602 %zero_cond = icmp eq i64 %iv, 0
603 br i1 %zero_cond, label %exit, label %range_check_block
604
605range_check_block:
606 %iv.next = sub i64 %iv, 1
607 %narrow = trunc i64 %iv.next to i32
608 %range_check = icmp ult i32 %narrow, %len
609 br i1 %range_check, label %backedge, label %fail
610
611backedge:
612 %el.ptr = getelementptr i32, i32* %arr, i64 %iv
613 %el = load i32, i32* %el.ptr
614 %loop.cond = icmp eq i32 %el, 0
615 br i1 %loop.cond, label %loop, label %exit
616
617exit:
618 ret void
619
620fail:
621 unreachable
622}
623
Max Kazantsevda9e7b12020-08-07 16:46:39 +0700[diff] [blame]624!0 = !{i32 0, i32 2147483647}